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Reports calls to <code>java.lang.Thread.sleep()</code> methods that occur
within a <code>synchronized</code> block or method.
<p>
  <code>sleep()</code> within a
  <code>synchronized</code> block may result in decreased performance, poor scalability, and possibly
  even deadlocking. Consider using <code>wait()</code> instead,
  as it will release the lock held.
</p>
<p><b>Example:</b></p>
<pre><code>
  synchronized (lock) {
    Thread.sleep(100);
  }
</code></pre>
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